2008 Census data reported that black women made 61 cents to white men's dollar. In 2010 [pdf], that gap had closed some, with black women earning 69.6% as much as white men. By contrast, white women earned 80.5 percent as much as white men in 2010, while Asian-American women earned 90.9 percent as much.

3. People with disabilities earn 86 percent as much as people without.

And that's if they work full-time. People with disabilities who work part-time earn just 64 percent as much as other part-time workers.

4. Gay men earn 11 to 27 percent less than straight men.

Three different studies found that gay men made less than straight ones, though the size of the disparity varied. Interestingly, one of these studies also found that lesbian women made 20 to 34% more than straight women.

In 2010, black men's earnings were 74.5% of white men's. That gap has actually widened in recent years — in 1999, black men made 80.6% as much as whites. And a 2005 report [pdf] points out that those numbers only compare men who actually have jobs — if you take into account black men who are jobless and/or incarcerated, the gap gets even worse.